build: try to use explicitly marked Python 3.x tools first
build: try to use explicitly marked Python 3.x tools first

Python 2.x is going EOL very soon, so let's require Python 3.x now
and attempt to use the explicitly marked Python 3.x tools first.

Signed-off-by: Paul Moore <a027184a55211cd23e3f3094f1fdc728df5e0500@paul-moore.com>
Acked-by: Tom Hromatka <96b9c1f2c09b98d7a09b4688fc637f1494d8e182@oracle.com>

seccomp/libseccomp,seccomp/libseccomp,seccomp/libseccomp